a(n) = Sum_{d|n, n/d=3 mod 4} d^3.

Terms

a(0) =0a(1) =0a(2) =1a(3) =0a(4) =0a(5) =8a(6) =1a(7) =0a(8) =27a(9) =0a(10) =1a(11) =64a(12) =0a(13) =8a(14) =126a(15) =0a(16) =0a(17) =216a(18) =1a(19) =0a(20) =370a(21) =8a(22) =1a(23) =512a(24) =0a(25) =0a(26) =730a(27) =64a(28) =0a(29) =1008